I just encountered this, attempting to upgrade 18.04 to 20.04. For me, the problem is that I have an IPv6-only system, but api.snapcraft.io is not reachable via IPv6.
I just encountered this, attempting to upgrade 18.04 to 20.04. For me, the problem is that I have an IPv6-only system, but api.snapcraft.io is not reachable via IPv6.